At present, our macOS voice installer is not “code signed” with Apple. As a result, it warns you that it could be dangerous to install software from an unknown developer. Our Mac installer is safe, but you may need to override the Mac protections to install it.

This link provides a description of Apple’s security measures and how to override them: https://support.apple.com/en-us/HT202491

My Mac says it’s not safe to install my voice. What can I do?